There are several Glucose infusion rate (GIR) calculators available in app store but all of them allow you to calculate GIR one drip at a time. Multi-drip GIR calculator is a simple GIR calculator which allows you to enter up to 4 drips with different glucose concentrations.
This update also includes reverse calculator where you can enter desired GIR, weight and fluid intake. App then calculates necessary % glucose concentration,